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lesson 1
fossil evidence of evolution
directions: use your textbook to respond to cach statement.
1. the diagram below represents a group of un disturbed rock layers. draw one fossil in
each of these rock layers: b, c, e, and g.
rock layer g
rock layer f.
rock layer e
rock layer d
rock layer c
rock layer b
rock layer a
2. write the terms older and younger on the correct lines on either end of the arrow to
correctly indicate the ages of the rocks in the rock layer diagram.
3. look at the fossil you drew in rock layer c.
a. which fossil (or fossils) are older?
b. which fossil (or fossils) are younger?
4. which fossil is the youngest?
5. what method of fossil dating does this activity represent?
6. which type of rock is most likely found in layers b, c, e, and g? explain your reasoning.
copyright glencoe mcgraw-hill, a division of the mcgww-hill companies inc
7. if rock layers a, d, and f are igneous rock, which type of dating could also be carried
out? explain your response.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic